JP4107434B2 - Water-based adhesive composition - Google Patents

Water-based adhesive composition Download PDF

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JP4107434B2
JP4107434B2 JP2004240378A JP2004240378A JP4107434B2 JP 4107434 B2 JP4107434 B2 JP 4107434B2 JP 2004240378 A JP2004240378 A JP 2004240378A JP 2004240378 A JP2004240378 A JP 2004240378A JP 4107434 B2 JP4107434 B2 JP 4107434B2
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toluene insoluble
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克尚 佐藤
順治 辻巻
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Aica Kogyo Co Ltd
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Description

本発明は耐熱性、コンタクト性に優れる水性接着剤組成物、詳しくはポリクロプレンラテックス、粘着付与樹脂エマルジョン並びに次式(1)に示される二塩基酸ジメチルエステルが配合されてなる耐熱性、コンタクト性に優れる水性接着剤組成物に関するものである。

Figure 0004107434
(R1、R2は水素原子および炭素数1〜6の直鎖若しくは分岐のアルキル基であつて、Mは炭素数1〜10のアルキレン基又はビニレン基を示す。) The present invention is an aqueous adhesive composition having excellent heat resistance and contact properties, and more specifically, heat resistance and contact properties obtained by blending polycloprene latex, tackifying resin emulsion, and dibasic acid dimethyl ester represented by the following formula (1). It is related with the water-based adhesive composition which is excellent in.
Figure 0004107434
(R1 and R2 are a hydrogen atom and a linear or branched alkyl group having 1 to 6 carbon atoms, and M represents an alkylene group or vinylene group having 1 to 10 carbon atoms.)

従来、ポリクロロプレンをベースとする接着剤は、ポリクロロプレンの結晶性による高い凝集力に起因する優れた接着力があり、粘着付与樹脂の併用効果による広い被着体適性と併せて広い範囲の用途に使用されてきた。
しかしながら有機溶剤を使用するものであるために毒性不安、環境汚染並びに防災管理上の問題などから、水性タイプが強く求められクロロプレンラテックスをベースとする水性コンタクト型接着剤が検討されている。
Conventionally, adhesives based on polychloroprene have excellent adhesive strength due to high cohesion due to the crystallinity of polychloroprene, and a wide range of applications in conjunction with wide adherend suitability due to the combined effect of tackifying resins Has been used.
However, since an organic solvent is used, an aqueous contact type adhesive based on chloroprene latex has been studied because an aqueous type is strongly demanded due to anxiety of toxicity, environmental pollution, and disaster prevention management problems.

水性タイプについては、これまでに実用的な性能として初期接着力、耐熱性、コンタクト性、保存性、接着性などのバランスを持つものを目指して過去に様々な検討がなされてきている。
例えば、従来、耐熱性を向上するために高分子量化を図るとゲル分(トルエン不溶分)が発生することからコンタクト性が犠牲になる、ゲル分(トルエン不溶分)のない範囲では高分子化されていないために耐熱性を確保できない、など耐熱性とコンタクト性を両立されるには課題があつたため、、特開平9−3423号では、ゲル分(トルエン不溶分)を含まないポリクロロプレンラテックスをベースに使用しながら、カルボキシル基と金属酸化物の架橋反応により高度なコンタクト性と接着力を確保する試みがなされたが、保管中に架橋反応が進行してしまい事実上使用できないなどの問題があった。
また、特開平11−158326号では、ゲル分(トルエン不溶分)や重量平均分子量を制御し、初期接着力、常態接着力、耐熱性などの改善を図っているが、乳化剤にアルキルフェニルスルホン酸型等の界面活性剤を使用している。このように界面活性剤を乳化剤として使用して合成されたポリクロロプレンラテックスは、PVAを保護コロイドとして合成したポリクロロプレンラテックスに比べ、凝集力、配合安定性、複合材接着力、耐熱性の点で劣り、本発明になる水性接着剤組成物の用途でもある建材用途には適用できない。
また特開2000−8012号公報では、添加樹脂の軟化点が100℃以下であることに加え、粘着付与樹脂のカルボキシル基をアルカリで中和・溶解させながら配合するため、耐熱性が不足し、耐水性が劣る、ポリクロロプレンラテックスとの相溶性が低下するなど粘着付与効果に限界があるなどの問題が残されていた。
Regarding the water-based type, various studies have been made in the past with the aim of achieving a balance of initial adhesive strength, heat resistance, contactability, storage stability, adhesiveness and the like as practical performance.
For example, conventionally, increasing the molecular weight in order to improve heat resistance will cause gel content (toluene insoluble content), resulting in sacrificing contact properties. In the range without gel content (toluene insoluble content) In order to achieve both heat resistance and contact properties, such as inability to ensure heat resistance because it has not been made, there is a problem, so in JP-A-9-3423, polychloroprene latex that does not contain a gel component (toluene insoluble component) Attempts have been made to ensure a high degree of contact and adhesion by the cross-linking reaction between carboxyl groups and metal oxides while using the base as a base, but the cross-linking reaction proceeds during storage, making it virtually impossible to use. was there.
In JP-A-11-158326, the gel content (toluene insoluble content) and the weight average molecular weight are controlled to improve the initial adhesive strength, normal adhesive strength, heat resistance and the like. A surfactant such as a mold is used. Polychloroprene latex synthesized using a surfactant as an emulsifier in this way is more cohesive, compounding stability, composite adhesive strength, and heat resistance than polychloroprene latex synthesized using PVA as a protective colloid. It is inferior and cannot be applied to a building material application which is also an application of the aqueous adhesive composition according to the present invention.
In addition, in JP 2000-8012 A, in addition to the softening point of the added resin being 100 ° C. or less, the carboxyl group of the tackifying resin is blended while being neutralized and dissolved with an alkali, so that the heat resistance is insufficient, There were problems such as poor water resistance and a limited tackifying effect such as poor compatibility with polychloroprene latex.

実用的な性能に関して言えば、ポリクロロプレンラテックスのゲル分(トルエン不溶分)が40重量%以下では接着強度、耐熱性、せん断強度が低下し、ゲル分(トルエン不溶分)が60重量%を超えると初期接着力、コンタクト力が低下する傾向が認められる。このような状況にあるためゲル分(トルエン不溶分)含有率を好都合な範囲にコントロールする必要がある。   In terms of practical performance, when the gel content (toluene insoluble content) of the polychloroprene latex is 40% by weight or less, the adhesive strength, heat resistance, and shear strength decrease, and the gel content (toluene insoluble content) exceeds 60% by weight. There is a tendency for initial adhesive strength and contact strength to decrease. Because of this situation, it is necessary to control the gel content (toluene insoluble content) in a convenient range.

特開平9−3423号公報Japanese Patent Laid-Open No. 9-3423 特開平11−158326号公報JP-A-11-158326 特開2000−8012号公報JP 2000-8012 A

本発明は前記のような課題、即ち、初期接着力、耐熱性、コンタクト性、保存性、接着性などのバランスのよい水性接着剤組成物を実現しようとするものである。 The present invention intends to realize an aqueous adhesive composition having a good balance of the above-mentioned problems, that is, initial adhesive strength, heat resistance, contactability, storage stability, adhesiveness and the like.

本発明は初期接着力、耐熱性、コンタクト性、保存性、接着性などのバランスのよいコンタクト型の水性接着剤組成物を実現しようとするものであり、ゲル分(トルエン不溶分)が40重量%〜60重量%であるポリクロロプレンラテックス(以下CRと略称する)、軟化点が100℃以上の粘着付与樹脂エマルジョン固形分10〜70重量部並びにアジピン酸ジメチル、コハク酸ジメチル、グルタル酸ジメチルの混合物0.1〜5重量部を配合することにより、前記課題を解決することができた。 The present invention is intended to realize a contact-type aqueous adhesive composition having a good balance of initial adhesive strength, heat resistance, contactability, storage stability, adhesiveness, etc., and has a gel content (toluene insoluble content) of 40 weight. % To 60% by weight of polychloroprene latex (hereinafter abbreviated as CR), 10 to 70 parts by weight of a tackifying resin emulsion solid content having a softening point of 100 ° C. or higher, and a mixture of dimethyl adipate, dimethyl succinate and dimethyl glutarate The said subject was able to be solved by mix | blending 0.1-5 weight part .

本発明になる水性接着剤組成物は、CR、軟化点が100℃以上の粘着付与樹脂エマルジョン並びにアジピン酸ジメチル、コハク酸ジメチル、グルタル酸ジメチルの混合物が配合されたものであるため、初期接着力、耐熱性、コンタクト性、保存性、接着性などのバランスがよく、各種の用途に利用できる。 Since the aqueous adhesive composition according to the present invention is a mixture of CR, a tackifying resin emulsion having a softening point of 100 ° C. or higher, and a mixture of dimethyl adipate, dimethyl succinate, and dimethyl glutarate , It has a good balance of heat resistance, contact properties, storage stability, adhesiveness, etc., and can be used for various applications.

以下、本発明について詳細に説明する。
本発明に係わるCRは2−クロロ−1、3−ブタジエン若しくはこれと共重合可能な単量体を乳化重合して得られるものであり、共重合可能な単量体としては、2、3−ジクロロ−1、3−ブタジェン、1−クロロ−1、3−ブタジェン、ブタジェン、イソプレン、スチレン、アクリロニトリル、各種(メタ)アクリル酸エステルのほか、アクリル酸、メタクリル酸、クロトン酸、フマル酸、マレイン酸、グルコン酸などエチレン性不飽和カルボン酸などが挙げられ、これら共重合可能な単量体は2種類以上が使用されても構わない。
なお、エチレン性不飽和カルボン酸を共重合したCRは木材等に存在する水酸基との反応による高い接着力、或いは金属など極性被着体との接着に好都合になる。
Hereinafter, the present invention will be described in detail.
The CR according to the present invention is obtained by emulsion polymerization of 2-chloro-1,3-butadiene or a monomer copolymerizable therewith. Dichloro-1,3-butadiene, 1-chloro-1,3-butadiene, butadiene, isoprene, styrene, acrylonitrile, various (meth) acrylic esters, acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid And ethylenically unsaturated carboxylic acids such as gluconic acid, and two or more kinds of these copolymerizable monomers may be used.
In addition, CR copolymerized with ethylenically unsaturated carboxylic acid is convenient for high adhesion by reaction with hydroxyl groups present in wood or the like, or adhesion to polar adherends such as metals.

CRには、高度にゲル分(トルエン不溶分)が制御されたものを使用する必要があり、40重量%〜60重量%であることが好ましい。
ゲル分(トルエン不溶分)は連鎖移動剤の使用と使用量、重合温度、重合率の制御などによりコントロールすることができる。
なお、ゲル分(トルエン不溶分)は、以下の方法で測定する。
[ゲル分(トルエン不溶分)]ラテックス試料を凍結乾燥し精秤してAとし、23℃で20時間、トルエンで溶解(0.6%に調整)したのち、遠心分離機を使用し、更に200メッシュの金網を用いてゲル分(トルエン不溶分)を分離する。ゲル分(トルエン不溶分)を風乾後110℃雰囲気下で1時間乾燥し、精秤してBとする。ゲル分(トルエン不溶分)は次式に従い算出する。 ゲル分(トルエン不溶分)=B/A×100(%)
It is necessary to use a CR whose gel content (toluene insoluble content) is highly controlled, and it is preferably 40% by weight to 60% by weight.
The gel content (toluene insoluble content) can be controlled by controlling the use and use amount of the chain transfer agent, the polymerization temperature and the polymerization rate.
The gel content (toluene insoluble content) is measured by the following method.
[Gel content (toluene insoluble content)] A latex sample was freeze-dried and precisely weighed to A, dissolved in toluene (adjusted to 0.6%) at 23 ° C. for 20 hours, and then centrifuged. The gel (toluene insoluble matter) is separated using a 200 mesh wire net. The gel content (toluene insoluble content) is air-dried and then dried in an atmosphere at 110 ° C. for 1 hour and precisely weighed to give B. The gel content (toluene insoluble content) is calculated according to the following formula. Gel content (toluene insoluble content) = B / A × 100 (%)

乳化重合の乳化剤には、一般的にはポリビニルアルコールやヒドロキシメチルセルロースなどの水溶性高分子、アニオン、ノニオン、カチオン型の界面活性剤が使用されるが、本発明に係わるCRの乳化重合は、ポリビニルアルコールおよびその共重合体の存在下において乳化重合されると、紙・木質基材への濡れ性、高い凝集力、耐熱や配合安定性等、様々な利点を有している点から好ましい。
また、ポリビニルアルコールとともに保護コロイド作用のある水溶性高分子を併用することも可能であり、例えば、ポリビニルエーテル及びその共重合体、ポリビニルピロリドン及びその共重合体、セルロース系誘導体などが挙げられる。また、前述の界面活性剤や脂肪酸アルカノールアミドなど、必要に応じて、ポリビニルアルコールと併用しても構わない。
In general, water-soluble polymers such as polyvinyl alcohol and hydroxymethyl cellulose, anionic, nonionic, and cationic surfactants are used as emulsifiers for emulsion polymerization. Emulsion polymerization in the presence of an alcohol and a copolymer thereof is preferable because it has various advantages such as wettability to paper / woody base material, high cohesive strength, heat resistance and blending stability.
It is also possible to use a water-soluble polymer having a protective colloid action together with polyvinyl alcohol, and examples thereof include polyvinyl ether and a copolymer thereof, polyvinyl pyrrolidone and a copolymer thereof, and a cellulose derivative. Moreover, you may use together with polyvinyl alcohol as needed, such as above-mentioned surfactant and fatty-acid alkanolamide.

本発明に使用されるポリビニルアルコールは特に限定されるものではないが、ケン化度60〜98モル%、重合度200〜3000のものが好ましく、より好ましくはケン化度75〜95モル%、重合度200〜700のものは重合操作を安定して行え、かつラテックスの安定性が良好であり、高濃度の安定したラテックスが得られる。
また、ポリビニルアルコールの添加量は、クロロプレン若しくはクロロプレンとその他共重合体の合計100重量部当たり0.5〜10重量部が好ましい。0.5重量部未満の場合には乳化力が不十分のために重合反応過程において凝集物が発生するため好ましくない。また10重量部を超えると重合反応過程で増粘が起こり、攪拌を阻害し、異常発熱するなど安定な乳化重合が困難になるため適さない。また耐水性が低下する傾向があり好ましくない。
The polyvinyl alcohol used in the present invention is not particularly limited, but preferably has a saponification degree of 60 to 98 mol% and a polymerization degree of 200 to 3000, more preferably 75 to 95 mol%. Those having a degree of 200 to 700 can carry out the polymerization operation stably, have good latex stability, and obtain a stable latex having a high concentration.
Moreover, the addition amount of polyvinyl alcohol is preferably 0.5 to 10 parts by weight per 100 parts by weight in total of chloroprene or chloroprene and other copolymers. When the amount is less than 0.5 part by weight, the emulsifying power is insufficient, and aggregates are generated in the polymerization reaction process. On the other hand, if the amount exceeds 10 parts by weight, viscosity is increased in the course of the polymerization reaction, and stirring is hindered. Moreover, there exists a tendency for water resistance to fall, and it is not preferable.

重合開始剤には、過硫酸カリウム、第3ブチルヒドロパーオキサイドなとの有機過酸化物などが使用され、あるいは亜硫酸ナトリウム、亜硫酸水素ナトリウム、ハイドロサルファイトナトリウム、ロンガリットなどの還元性物質を併用して乳化重合を進めることもできる。
重合温度は円滑、安全に進めるために30〜50℃を採用することが好ましい。
連鎖移動剤の種類に関しては特に制限無く、通常クロロプレンの乳化重合に使用されるものが使用できるが、ザンテート系あるいはメルカプタン系のものが好適である。
重合停止剤は特に限定されるものではなく、例えば、2,6−ターシャリーブチルー4−メチルフェノール、フェノチアジン、ヒドロキシアミン等が使用できる。最終重合率は目的のクロロプレン系共重合体の性状を制御するため、任意に調整できる。
As the polymerization initiator, organic peroxides such as potassium persulfate and tert-butyl hydroperoxide are used, or reducing substances such as sodium sulfite, sodium hydrogen sulfite, sodium hydrosulfite and Rongalite are used in combination. The emulsion polymerization can be advanced.
The polymerization temperature is preferably 30 to 50 ° C. in order to proceed smoothly and safely.
The type of chain transfer agent is not particularly limited, and those usually used for emulsion polymerization of chloroprene can be used, but xanthates or mercaptans are preferred.
The polymerization terminator is not particularly limited, and for example, 2,6-tertiarybutyl-4-methylphenol, phenothiazine, hydroxyamine and the like can be used. The final polymerization rate can be arbitrarily adjusted in order to control the properties of the target chloroprene copolymer.

粘着付与樹脂エマルジョンには、変性ロジン樹脂、重合ロジン樹脂、α−ピネン樹脂、β−ピネン樹脂、テルペン樹脂、テルペンフェノール樹脂、アルキルフェノール樹脂、スチレン樹脂、キシレン樹脂、クマロン樹脂、クマロンインデン樹脂、石油系炭化水素樹脂などが挙げられ、これらのエマルジョン化されたものを単独、あるいは併用して添加することができる。中でも接着層の耐熱性を確保するため軟化点が100℃以上のものが好ましく、軟化点が100℃以下のものでは耐熱性が低くなるため適さない。
また、CRに対する粘着付与樹脂エマルジョンの配合割合は、CRの固形分100重量部に対して10〜70重量部が適している。10重量部以下では被着体に対する密着性を確保できないこと、更には粘着付与効果が充分でなく好ましくない。70重量部以上では接着力の低下が起こるため好ましくない。
Tackifying resin emulsions include modified rosin resin, polymerized rosin resin, α-pinene resin, β-pinene resin, terpene resin, terpene phenol resin, alkylphenol resin, styrene resin, xylene resin, coumarone resin, coumarone indene resin, petroleum Type hydrocarbon resins and the like, and these emulsions can be added alone or in combination. Among them, those having a softening point of 100 ° C. or higher are preferable in order to ensure the heat resistance of the adhesive layer, and those having a softening point of 100 ° C. or lower are not suitable because the heat resistance is lowered.
Moreover, 10-70 weight part is suitable for the mixture ratio of tackifying resin emulsion with respect to CR solid content of 100 weight part. If it is 10 parts by weight or less, the adhesion to the adherend cannot be secured, and the tackifying effect is not sufficient, which is not preferable. An amount of 70 parts by weight or more is not preferable because a decrease in adhesive force occurs.

なお、粘着付与樹脂のエマルジョン化には、トルエンなどの溶剤に溶解させたものを乳化剤を使用して水中に乳化・分散させたのち、(イ)溶剤を減圧下で加熱しながら揮発除去する方法、(ロ)微粒子に粉砕したものを乳化する方法、(ハ)圧力釜中で軟化点以上に加熱したのち乳化剤を練りこみ熱水を除除に添加し転相乳化する方法など、があるが、より微粒子に仕上るには(イ)若しくは(ハ)の方法が好ましい。   To emulsify the tackifying resin, a solution obtained by dissolving it in a solvent such as toluene is emulsified and dispersed in water using an emulsifier, and then (a) removing the solvent by volatilization while heating under reduced pressure. , (B) a method of emulsifying finely pulverized fine particles, (c) a method of emulsifying an emulsifier after heating in a pressure kettle above the softening point and adding hot water to remove the phase, followed by phase inversion emulsification. The method (a) or (c) is preferable for finishing finer particles.

工業的にはアジピン酸ジメチル、コハク酸ジメチル、グルタル酸ジメチルの混合物であるDBE(組成範囲:アジピン酸ジメチル10〜25重量%、グルタル酸ジメチル55〜65重量%、コハク酸ジメチル15〜25重量%)がインベスタジャパン社から市販され、高溶解力、流動性、低環境負荷と低毒性、低臭、低揮発性などの特徴を持つことから、本発明の水性接着剤組成物への使用に適している。
これらは、CR及び粘着付与樹脂の軟化並びに被着体との接着性を向上するために配合されるもので、CRの固形分100重量部当たり0.1〜5重量部の範囲で配合されることが好ましい。0.1重量部以下では接着層の軟化作用が得られないため好ましくない。一方、5重量部以上では軟化による耐熱性低下が観察されるため、ゲル分(トルエン不溶分)を制御されたCRを使用する効果が低下するため適さない。
Industrially, DBE which is a mixture of dimethyl adipate, dimethyl succinate and dimethyl glutarate (composition range: dimethyl adipate 10 to 25% by weight, dimethyl glutarate 55 to 65% by weight, dimethyl succinate 15 to 25% by weight) ) Is commercially available from Investa Japan, and has characteristics such as high dissolving power, fluidity, low environmental load and low toxicity, low odor, and low volatility. Therefore, it is suitable for use in the aqueous adhesive composition of the present invention. Is suitable.
These are blended in order to soften the CR and tackifying resin and improve the adhesion to the adherend, and are blended in the range of 0.1 to 5 parts by weight per 100 parts by weight of CR solids. It is preferable. The amount of 0.1 parts by weight or less is not preferable because the softening action of the adhesive layer cannot be obtained. On the other hand, if the amount is 5 parts by weight or more, a heat resistance decrease due to softening is observed, so that the effect of using CR with controlled gel content (toluene insoluble content) decreases, which is not suitable.

以下、本発明を実施例、比較例により詳細に説明する。
なお、重量部は単に部として記載する。
実施例1〜4
ゲル分(トルエン不溶分)54重量%のCRであるOL−0453(電気化学工業株式会社製、固形分55%、pH7)、ゲル分(トルエン不溶分)43重量%のCRであるOL−0460(電気化学工業株式会社製、固形分55%、pH7)、ゲル分(トルエン不溶分)47重量%のCRであるOL−0460−2(電気化学工業株式会社製、固形分55%、pH7)、ゲル分(トルエン不溶分)57重量%のCRであるOL−0524(電気化学工業株式会社製、固形分55%、pH7)、軟化点120℃の重合ロジンエステル系の粘着付与樹脂エマルジョンKNS120(荒川化学工業株式会社製,固形分55%、pH5)並びにDBE(インベストジャパン社製)を表1の通り配合して実施例1〜4の水性接着剤組成物を調製した。
各実施例の水性接着剤組成物のコンタクト率並びに耐熱性は表1の通りであった。
Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.
In addition, a weight part is described as a part.
Examples 1-4
OL-0453 which is CR having a gel content (toluene insoluble content) of 54% by weight (manufactured by Denki Kagaku Kogyo Co., Ltd., solid content 55%, pH 7), OL-0460 which is CR having a gel content (toluene insoluble content) of 43% by weight. (Electrochemical Industry Co., Ltd., solid content 55%, pH 7), gel content (toluene insoluble content) 47 wt% CR, OL-0460-2 (Electrochemical Industry Co., Ltd., solid content 55%, pH 7) OL-0524 (manufactured by Denki Kagaku Kogyo Co., Ltd., solid content 55%, pH 7) having a gel content (toluene insoluble content) of 57% by weight, a polymerized rosin ester-based tackifier resin emulsion KNS120 (softening point 120 ° C.) Arakawa Chemical Industries, Ltd., solid content 55%, pH 5) and DBE (manufactured by Invest Japan) were blended as shown in Table 1 to prepare aqueous adhesive compositions of Examples 1-4.
Table 1 shows the contact ratio and heat resistance of the water-based adhesive composition of each example.

比較例1〜8
ゲル分(トルエン不溶分)10重量%のCRであるOL−0452(電気化学工業株式会社製、固形分55%、pH7)、ゲル分(トルエン不溶分)17重量%のCRであるOL−0478(電気化学工業株式会社製 固形分55%、pH7)、ゲル分(トルエン不溶分)28重量%のCRであるOL−0413(電気化学工業株式会社製、固形分55%、pH7)、ゲル分(トルエン不溶分)37重量%のCRであるOL−0460−1(電気化学工業株式会社製、固形分55%、pH7)、ゲル分(トルエン不溶分)66重量%のCRであるOL−0525(電気化学工業株式会社製固形分55%、pH7)、ゲル分(トルエン不溶分)54重量%のCRであるOL−0453(電気化学工業株式会社製、固形分55%、pH7)、軟化点120℃の重合ロジンエステル系の粘着付与樹脂エマルジョンKNS120(荒川化学工業株式会社製、固形分50%、pH5)、軟化点75℃のロジンエステル系の粘着付与樹脂エマルジョンKNS75(荒川化学工業株式会社製、固形分50%、pH5)、DBE(インベスタジャパン社製)並びに可塑剤であるCS−12(チッソ株式会社製、 2,2,4−トリメチルペンタンジオール−1,3−モノイソブチレート)を表2の通り配合して比較例1〜8の水性接着剤組成物を調製した。各比較例の水性接着剤組成物のコンタクト率並びに耐熱性は表2の通りであった。
Comparative Examples 1-8
OL-0442 (CR, having a gel content (toluene insoluble content) of 10% by weight, CR, OL-0478 (manufactured by Denki Kagaku Kogyo Co., Ltd., solid content 55%, pH 7) (Electrochemical Industry Co., Ltd., solid content 55%, pH 7), gel content (toluene insoluble content) 28 wt% CR, OL-0413 (Electrochemical Industry Co., Ltd., solid content 55%, pH 7), gel content (Toluene insoluble content) OL-0460-1 which is CR of 37% by weight (manufactured by Denki Kagaku Kogyo Co., Ltd., solid content 55%, pH 7), gel content (toluene insoluble content) OL-0525 which is CR of 66% by weight (Electrochemical Industry Co., Ltd., solid content 55%, pH 7), gel content (toluene insoluble content) 54 wt% CR, OL-0453 (Electrochemical Industry Co., Ltd., solid content 55%, pH 7), softening point Polymerized rosin ester tackifier resin emulsion KNS120 (Arakawa Chemical Industries, solid content 50%, pH 5) at 120 ° C., rosin ester tackifier resin emulsion KNS75 (Arakawa Chemical Industries, Ltd.) with a softening point of 75 ° C. , Solid content 50%, pH 5), DBE (manufactured by Investa Japan) and plasticizer CS-12 (manufactured by Chisso Corporation, 2,2,4-trimethylpentanediol-1,3-monoisobutyrate) Were mixed as shown in Table 2 to prepare aqueous adhesive compositions of Comparative Examples 1-8. Table 2 shows the contact ratio and heat resistance of the aqueous adhesive compositions of the comparative examples.

Figure 0004107434
Figure 0004107434

Figure 0004107434
試験・評価方法
1.コンタクト性:被着体としてラワン合板(タイプΙ、12mm厚)同士を使用し、実施例、比較例の水性着剤組成物を両面均一に100g/m塗布したのち、5℃・湿度90%の環境下において、2時間乾燥後に0.2MPaの圧力で貼り合わせたときのコンタクト率を測定する。 ○:50%以上、△:30〜50%、×:30%以下
2.耐熱性:被着体としてラワン合板(タイプI、5.5mm厚)とメラミン樹脂化粧板(1mm厚)とを使用し、実施例、比較例の水性接着剤組成物を両面に100g/m塗布したのち、23℃で30分間乾燥後に0.2MPaの圧力で接着し、23℃で24時間養生後、50℃雰囲気下で500g荷重を掛け落下するまでの時間(分)を測定する。
Figure 0004107434
Test / Evaluation Method Contactability: Lauan plywood (type Ι, 12 mm thickness) is used as adherends, and 100 g / m 2 of aqueous adhesive compositions of Examples and Comparative Examples are uniformly applied on both sides, and then 5 ° C. and 90% humidity. In this environment, the contact rate is measured when bonded at a pressure of 0.2 MPa after drying for 2 hours. ○: 50% or more, Δ: 30 to 50%, ×: 30% or less Heat resistance: Lauan plywood (type I, 5.5 mm thickness) and melamine resin decorative board (1 mm thickness) were used as adherends, and 100 g / m 2 of the aqueous adhesive compositions of Examples and Comparative Examples on both sides. After coating, drying at 23 ° C. for 30 minutes and then bonding at a pressure of 0.2 MPa, curing at 23 ° C. for 24 hours, and then measuring the time (minutes) until dropping by applying a 500 g load in a 50 ° C. atmosphere.

本発明になる水性接着剤組成物は、初期接着力、耐熱性、コンタクト性、保存性、接着性などのバランスがよいため、家具などの建材分野、長尺シートの接着施工分野、自動車内装材接着分野、金属やプラスチックなどとの複合材接着分野など各種の用途に利用できる。 The water-based adhesive composition according to the present invention has a good balance of initial adhesive strength, heat resistance, contactability, storage stability, adhesiveness, etc., so that it can be used for building materials such as furniture, long sheet adhesive construction, automobile interior materials. It can be used for various applications such as the bonding field, and the bonding field of composite materials with metals and plastics.

Claims (1)

ゲル分(トルエン不溶分)が40重量%〜60重量%であるポリクロロプレンラテックス固形分100重量部に対して、軟化点が100℃以上の粘着付与樹脂エマルジョン固形分10〜70重量部並びにアジピン酸ジメチル、コハク酸ジメチル、グルタル酸ジメチルの混合物0.1〜5重量部が配合されていることを特徴とする水性接着剤組成物。 10 to 70 parts by weight of a solidified tackifier resin emulsion having a softening point of 100 ° C. or higher and 100 parts by weight of adipic acid with respect to 100 parts by weight of polychloroprene latex solids having a gel content (toluene insoluble content) of 40% to 60% by weight A water-based adhesive composition comprising 0.1 to 5 parts by weight of a mixture of dimethyl, dimethyl succinate and dimethyl glutarate .
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